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109 lines
2.5 KiB
JavaScript
109 lines
2.5 KiB
JavaScript
#!/usr/bin/env node
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//# vi: ft=javascript
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var fs = require('fs');
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var path = require('path');
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var _ = require('lodash');
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var async = require('async');
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var express = require('express');
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var handlebars = require('handlebars');
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var app = express();
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var staticHandler = express['static'].bind(express);
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app.use((function log() {
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var text = '{{date}} {{req.method}} {{req.url}}';
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var logTemplate = handlebars.compile(text);
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return function (req, res, next) {
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console.log(logTemplate({date: new Date().toISOString(), req: req}));
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next();
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};
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}()));
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function renderError(res, err) {
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console.error(err);
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res.writeHead(500, {'Content-Type': 'text/plain'});
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res.write(err);
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}
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function pathToFile() {
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return path.normalize(
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path.join.apply(null, [__dirname, '..'].concat(_.toArray(arguments)))
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);
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}
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app.get('/', function index(req, res) {
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var indexFile = pathToFile('assets', 'index.html');
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function compileServe(err, text) {
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if (err) {
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renderError(res, err);
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return;
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}
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var tmpl = handlebars.compile(text);
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res.send(tmpl());
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}
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fs.readFile(indexFile, {encoding: 'utf8'}, compileServe);
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});
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function serveIfExists(path) {
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return function _serveIfExists(cb) {
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fs.exists(path, function (exists) {
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if (!exists) {
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cb(null, null);
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return;
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}
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fs.readFile(path, {encoding: 'utf8'}, cb);
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});
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};
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}
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app.get(/slide\/(\d+)/, function showHandler(req, res, next) {
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var slideId = req.params[0];
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var slidePath = pathToFile('data', 'slide', slideId + '.json');
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fs.exists(slidePath, function (exists) {
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if (!exists) {
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next();
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return;
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}
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fs.readFile(slidePath, {encoding: 'utf8'}, function (err, content) {
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if (err) {
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renderError(res, err);
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return;
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}
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try {
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var slide = JSON.parse(content);
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} catch (err) {
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renderError(res, err);
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return;
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}
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async.parallel({
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copy: serveIfExists(pathToFile('data', 'copy', slide.copy + '.md')),
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code: serveIfExists(pathToFile('data', 'code', slide.code + '.js'))
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}, function (err, slideContent) {
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if (err) {
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renderError(res, err);
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return;
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}
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slideContent.id = parseInt(slideId, 10);
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slideContent.title = slide.title || '';
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res.send(slideContent);
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});
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});
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});
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});
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app.use('/data', staticHandler('data'));
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app.use('/vendor', staticHandler('vendor'));
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app.use('/static', staticHandler('static'));
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app.listen(8000);
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